Katy Perry

President Obama certainly has his share of celebrity supporters, so when he won reelection on Tuesday night, you could feel the joy radiating off their Twitter pages. While Donald Trump came hilariously unhinged, other (actual) celebs celebrated in expected fashion.

Unlikely BFFs and singers Katy Perry and Rihanna are reportedly having a bit of a tiff right now over a man. And not in the usual way women fight over men in soap operas and sitcoms -- this stems from Rihanna letting abusive ex-boyfriend Chris Brown back in her life.

It looks as though Katy Perry is still on that disastrous trip-to-nowhere known as dating John Mayer. The on-again, off-again, on-again couple were spotted out on Tuesday night dining in New York City for Mayer's 35th birthday. But anyone expecting drunken antics or a messy public break-up was sadly disappointed.

Katy Perry and John Mayer being together is still whipped-cream-shooting-from-your-boobs weird. But she did marry Russell Brand so ... it's probably a wash. Regardless, Jaty or Kohn or whatever the tabloids are calling them are still on, and their latest relationship endeavor took them to Las Vegas. Because a place dubbed Sin City is exactly where you go when you want a little peaceful quality ti